4 years ago, I bagged Homunculus with C11+Canon 60D,
link is here.
Over last weekend I tried again, this time with IMX291 webcam and C11+FR.65, processed in SharpCap and Registax.
The circular artifact is the consequence of eta being saturated and aggressive use of wavelets to bring out the Homunculus itself.
The image is stack of 124 frames, exposure time was 63.5 ms.